The ’19 Kids and Counting’ stars are devastated by the loss of their littlest sibling. Now they’re opening up about dealing with the tragedy.

Michelle tells PEOPLE that their son Jackson, 7, was especially shaken by the loss of his baby sister Jubilee Shalom.

“I told him there is going to be a day when we are going to be together again,” she says. “As the days go on, I know we will have time to talk through all this. I have been trying to hold my composure and do what I needed to do, and then be able to grieve.”

Meanwhile, Michelle is staying strong through the loss.

“Our calendar is cleared off, and we are going to take time to talk and pray and cry,” she says. “This is going to be a time for our family to just be together.”